Track jumping method for an optical disk reading head
US5121373A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1989 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Oct 25, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S358/907
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Track jumping in the present system is accomplished by using a two step track jump method which accelerates the tracking actuator toward the desired track at maximum acceleration and then decelerates the tracking actuator at a maximum deceleration so that the desired track is reached in a minimum amount of time without the actuator ringing. A matrix containing the times for each jump pulse from track X to track Y is recorded. The matrix table is updated after each jump to compensate for variance factors. The table is stored in memory which allows the system to become more accurate with each jump. If the actuator falls short of the desired position, the jump pulse next applied is lengthened slightly. If the jump pulse causes the actuator to overshoot, the desired position the jump pulse is shortened for the next jump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.